USDM ITR block w/USDM ITR pistons and ITR crank
ITR head milled 0.020"
stock head gasket

What kind of numbers are you guys getting for static CR?

-kenji

 

~11.3-11.4:1

 

I would bet 11.0 - 11.1 CR

 

I'm at about 11.4-11.5 with a JDM B18C(r) and a .020"mill. and stock gasket.

 

According to the compression calulator on c-speedracing, it is about 11.17

 

should be around 11.3-11.4

 

I concur...

 

and how do you know that its correct?
its already got one calc wrong. whos to say that they arent all wrong?

 

I remember the instance when c-speed's calc was wrong....

Steve - How did you arrive at 11.3-4?
Every time someone ask about 'what the compression will be', everyone says "it SHOULD be around x-y". No one ever has a definite, exact answer.

Since the stock ITR compression is correct on c-speed's calc, I'd say by changing only one variable (the change made by milling 0.02"), that it is improbable that this change would make for an incorrect calc. I could very well be wrong...

No offense intended whatsoever. I'm just wondering where people get their estimates/exact figures in these cases.


[Modified by Chris N, 1:11 PM 2/5/2003]

 

it's a simple formula and Crescent's stats are accurate. If you doubt it, then do the formula yourself

 

reason for using the word SHOULD is you never have exact measurements.
differences in gasket thicknesses, actual deck and cylinder head heights will
play a role in determining the EXACT CR.

 

Thanks Steve.

 

Want an exact figure?